Centerless grinding machine



March 2 1926. 1,575,558

s. EINSTEIN Er AL GENTERLES S GRI NDI NG MACHI NE Filed Jan. 18. 1924 25119915-91361, 1

anar-sega,

kw r A# March 2,1926. 1,575,558v

S. EINSTEIN ET AL CENTEHLESS GRINDING MACHINE Filed Jan. 18, 1924 2Sheets-Sheet 2 hanged Mar. 2, '1926.`

UNITED STATES PATENT oFFicE.

SOL EINSTEIN AND LESTER F. NENNINGEB., F CINCINNATI, AND WALTER D.ARCHEA,

OF N ORWOOD, OHIO, ASSIGNORB T0 THE CINCINNATI MILLING MACHINE COM-PANY, OF CINCINNATI, OHIO, A CORPORATION OF OHIO.

CENTERLESS GRINDING MACHINE.

Application lledllanuary 18, 1924. Serial No. 687,063.

To all 'whom t 'may concern.'

Be it known that we, Sen EINSTEIN, LEs- TER F. N ENNINGER, and WALTERDJARCHEA, citizens of the United States, residing respectively, atCincinnati and at Norwood,in the county of Hamilton and State of Ohio,have invented certain new' and useful Improvements in CenterlessGrinding Machines, of which the following is a specification.

This invention pertains to center-less grinding machines for grindingarticles of circular cross section, particularly such as are providedwith a head, a shoulder or l5 shoulders, or both. The machine may alsodo taper grinding, and the mechanism to which the invention is morespecifically directed, that is to say, mechanism for automaticallyejecting the work when ground t0 the desired extent, is capable of usein the grinding of the several classesof objects indicated.

The invention is illustrated in the accompanying drawings, in which:

Figure l is a side elevation of so much of the grinding machine as isnecessary properly to illustrate the automatic work-ejecting mechanismin itsrelation to the grind/- ing machine; Y

Fig. 2, an end elevation of the machine showing the automatic mechanismfor actuating the ejector, the motor drive, etc., as viewed from thegoverning or control wheel end;

Fig. 3, a perspective view of the worksupp'ort, showing details oftheejector and its connection with the oscillating shaft which actuates it;

Fig. 4, a sectional elevation illustrating 40 the construction of thelatch through which the oscillating shaft is alternately engaged, turnedin actuating direction, and released; Fig. 5, -a sectional view of aportion of the main bed of the grindin machine,

showing the governing or contro -wheel carrier and a slide interposedbetween the same and the machine bed.

Fig. 6 is a fragmentary view of the b1111- ter Stem and guide.

Vbe used to hol 'Ihe grinding machine here indicated is' of thatA typein which there is provided a suitable main frame or base 1 having asubstantially horizontal bed or top-plate 2 carrying in suitablebearings a grinding wheel 3 and a governing or control-Wheel 4 of like l0r similar material. The Wheels 8 and 4 are mounted upon shafts orarbors, and independently rotated in the same direction about theirrespective axes and at appropriate speeds, said Wheels, either or both,bcing adjustable to vary the distance between the two, and thus to gageor determine the diameter to which the Work, or a portion or portionsthereof, shall be ground. The ot'- ce of the governing or control-Wheelis to insure the rotation of such work or ohject at predetermined anduniform ,surface speed, while it is sup orted upon the workrest anpressed or tive surface Vot' the grinding wheel.

In the machine illustrated the wheels are peripherall; opposed, and awork-rest is lnterposed etween their proximate peripheral faces, andserves to support the work or object beingr ground. This work-rest asbest seen in Fig. 3, comprises a main base or member 5, and a speciallydesigned work-support 6 in the form of a plate or blade, which" latteris varied in form and dimensions to ysuit the particular work to behandled; In practice, a plurality of blades or direct Work-supports isprovided, the sa'me being interchangeable to adapt the machine to thehandling of objects of any` particular form or dimensions.

lVhile the mechanism which constitutes the present inventionA is 'hereshown and described in connection with this articular type of grindingmachine, it is to e understood that it is designed for and ca able ofuse with machines of other types, w ether the of the grinding wheel, oru on the side face as 1s commonly done wit grinders of disk type, andwhether a control-wheel or some other ga ing and supporting. device dthe work properly against the grlndlng surface.

eld against the ef't'ec-v grinding be done upon the periphery Thegeneral position and arrangement of the work-rest and its supportingblade will, be seen upon referring to Fig. 1. In the resent instance thebase 5 of the work-rest is secured to a slide 7 having longitudinalguiding ribs 8 closely fitting similar ribs 9 formed upon the top orbed-plate of the base or main frame 1, as seen in the several figures.This dovetail guideway construction is common in machines of this class,and may include adjustable or replaceable filling or wear strips 10 suchas shown in Fig. 3, between the slide 7 and the carrier 11 of thecontrol-wheel 4, where the like dovetail construction is employed. Thecarrier 11 is in therform of a hollow shell or box, and is provided withclamping means of any approved or usual construction, operable b ahand-lever 12, at the infeeding side o the machine, and serving to locksaid carrier firmly and rigidly to the slide 7, or to release saidcarrier when it is desired to adjust it relatively to slide 7, or toadjust slide 7 relatively to the carrier. Similarly, slide 7 is providedwith like clamping means operable by` a hand-lever 13 for ri idlyclamping said slide to its ways on t e bed or toplate 2 of the mainframe 1. These may e simple cams or wedges.

v Adjustment ofslide 7 is made when necessary, to position the Work-rest5-6 propcrly between the opposed grinding and governing orcontrol-wheels 3 and 4, the base 5 of the work-rest sbeing rigidlysecured to the inner end of said slide. The adjustment of the carrier1,1 relatively to the slide is to accurately gauge the width of thespace between the grindinfr and governing wheels to insure the grin ingof the object to the recise diameter desired. lVhen, therefore, 1t isnecessary to position the work-rest initially for a given piece of work,the carrier 11 is run slightly backward or away from the grinding wheel3 and clamped to the slide 7, which togetherwith the carrier is thenmoved inward or outward as required, to ppsition the work-rest base 5andthe r -sup orting and guiding blade or bar 6. The s 1de 7 is thenclamped firmly to the bed-plate or top 2 of the machine. Carrier 11isnext disengaged or unclamped from slide 7, and is moved to eti'ect thepro er positioning of the governing or contro wheel -l relatively togrinding wheel 3.

These movements of the slide 7 and carrier 11 jointly, or of the carrier11 alone, are eii'ected by a screw 14 passin throu h and threaded intosleeve 15 swive ed in t ie shell or carrier 11 in any convenient way,the stem or shank of the screw being in turn swiveled in an arm orbracket 16 rising from the main frame or base of the machine, and havingthe arm in which said stm is swiveled, split and capable of being drawninto Lgripping or binding contact withthe stem by a pinch-screw or bolt17. The outer extremit of the screw stem isprovided with n han wheel `orspoke-wheel 18 by which to rotate the screw and advance or recede thecarrier 11, the sleeve 15^being at such time held in any convenient wayagainst rotatin with the screw. Under this arran ement it is possible toadvance and recede t e carrier, with or without the slide 7, manually,by turning the screw 14 through the medium of wheel 18, the pinch-screw17 being at such times backed to free the stein of the screw, and it isfurther possible upon tightening said pinch-screw and thus binding thestein of screw 1-1, to advance or recede the carrier, with or withoutthe slide 7, by rotating the sleeve 15, for which purpose said sleeve isprovided with a radial arm 19, here shown as formed withV a hub orcollar encircling the sleeve and secured thereon by a set-screw 20.y

The automatic ejecting device is brought into action only after the workhas been ground to the predetermined extent, and after the overnlng orcontrol-Wheel 4 has been "rece ed suiliciently to completely free theground object. This is effected by bringin"r the objects to the groundto the machine with the latter ad'usted to remove a definite quantity orthic ness or metal, or to grind toV a certain depth, and continuing thegrinding until the objectrees itself' in the space between the grindingand governing or control-Wheel, as is well understood in the art. It isdesirable, however, that the automatic mechanism for separating thegrinding and control-wheels be so constructed, arranged, and adjusted asto ermit the grindin to continue a aerioci) of time adequate orcompleting t e predetermined amount of grinding with, advisably,`aslight margin or excess of time, to guard against premature actuation ofthe ejecting devices, which will now be dcscribed in detail.

As shown in Fig. 3, this ejecting device comprises a horizontal arm 2lsecured upon Aor made integral with the base 5 ofthe Workrest, andhaving an linternal longitudinal guideway to -receive and permitreciprocaton of a block 22 of polygonal cross section, and also topermit oscillation of a lever 23 ulcrumed between ears or lugs 2lprojecting from one end of the bascs of the work-, rest. The arm forlever ,23 is slotted or forked at its upper end to -receive ahorizontallyrojecting pin or stud 25 carried by the s iding block 22.,Said block 22 is secured upon a rod or stem 26evhich projects throughopenings in the ends of arm 21, its inner-end being provided with a,head or bunter 27 movable lengthwise ever and just above the beveled uper edge of the worksupportmg blade or Ear 6 in position to contact withthe leadin end of the inserted work, and to push t e finished workoutward.

Carried in ears or guides 28 projecting from the base 5 of the Work-restis a rod 29 which carries at one end a radial arm 30, the outer end ofwhich is preferably reduced and Iis carried through an elongated eningin the lower end of lever 23, so that i the rod 29 be longitudinallyreciprocated it shall swing the lever 23 about its fulcrum, and move rod26 and bunter 27 inward over the worksupporting plate or bar'6, causingthe bunter to ejectthe work lying thereon and between the grinding undthe governing wheels 3 and 4. A s )ring 31, .here shown as of helicalform and encircling rod 29, bears at one end against the ear 28 nearestthe radial arm30, and at its opposite end against a screw or stud 32, orother abutment on rod 29, and serves to return said rod and the arm 30to the normal position in which they are shown in Fig. 3, this action inturn serving to retract or move outward rod 26 and bunter 27, thusleaving the Work-supporting bar 6 clear and ready to receive a newarticle to be ground.

For the purpose of actuating the ejector and `placing spring 31 undercompression sufficient to restore!A the actuating devices to normalosition, there is employed an oscillating siaft or rod 33 provided witha radial or crank-arm 34 having at its outer end a pin '35 which entersa vertical slot .in the side of a block 36 secured upon the end of rod29 opposite that which carries the arm 30. Shaft, or rod 33'is carriedat one end in a supporting arm or bracket 37, shown in Figs. 1 and 3,secured to slide 7, its opposite end passing through openings in ears 38of a bracket 39 carried by the shell or carrier 11, and through thecentral opening of a disk or hub 40 placed between the ears 38. l

The shaft 33 is longitudinally grooved to receive akey, rib or stud 41seated in the `wall of the central opening of disk 40, to

permit relative axial movelnent of said disk and shaft. This provisionis made in order that the carrier 11 and connected parts may be movedforward and backward upon the slide 7, or that the slide 7 may be movedforward and backward relatively to carrier 171` without disturbing theeffective relation of shaft 33 and disk or hub 4f). As seen in Figs. 2and 4, the circumference of the disk or halb 4() is cut away at onepoint to leave a shoulder or abutment 42 for engagement by an overlyinglatch or do" 43 ivoted to swing vertically in a slot fbi'me in' asliding bar 44 lon itudinally movable in a guideway forme in the bracket39, as best Seen in Fig. 4. Y

To insure the prompt fall of the free end of latch 43 when it movesoutward over the hub or disk 4l), and its engagement with the l shoulderor abutment 42 on the return movement, a sprinv 45 is advisably arrangedto bear against tlcie inner end of the latch above its pivot. The underside of bar 44 is cut .away at the inner end of said bar, leaving anelongated lecess, the outer Wall of which forms a tooth 46 which isengaged by a bent rod or arm 47, Figs. 1 and 4, one end of which isthreaded and screwed into a tapped hole in the oscillatinor arm 19, thethreaded portion being provided with a jam-nut 48 to prevent theunscrewing or loosening and turning o f the rod 47. This construction.and arrangelnentsof the rod 47 makes it possible to'swing it about thethreaded end as a pivot, and thus to vary the time of its engagementwith the tooth 46 when the arm i9 swin s toward said tooth.

To e ect oscillation of arm 19 and colisequent engagement of rod 47 withtooth 46 for moving bar 44 in a direction to turn hub or disk 40, andalso for the purpose of oscillating the sleeve 15, there is provided themechanism illustrated in Figs. 1 and 2. This comprises a motor 49, thebase 50 of which is made fast to the top of carrier or shell 11, thearmature shaft 51 being provided with Ya gear 52 which meshes with apinion 53 on the shaft of a worm 54 journaled in a supporting standard55, and meshing with a Worm-whee` 56 carried by a shaft 57 journaled inbearings in the base of the supporting standard 55. Any sui-table gearratio may be employed between the motor shaft and worm-shaft, and themotor may if desired be provided with a rheostat or other usual meansfor varying and determining the speed of rotation of its armature andshaft, and consequently the speed of shaft 57. Shaft 5.7 will be causedto make one cornplete rotation for a predetermined number of rotationsof the governing or controlwheel 4, which in turn will effect or permita predetermined number of rota-tions of the fwork being ground, and thislatter number will be such as shall insure the requisite undpredetermined depth of grinding of the object treated.

Shaft 57 carries a crank-arm 58, the crankpin 59 of which passes throughan eye of one member 60 of a divided or two-part pilman, the secondmember G1 of which is similarly connected with u pin carried by theswinging end of oscillating arm 1S). the two parts of the pltman beingconnected h v a tubular sleeve 62.' see Figs. .1 and 2. Thepinnen-section 60 fit and is movable through an opening in the upper endor head of sleeve 62, and carries within said sleeve a head or piston63, while the section 61 is made fast in or to the lower end of saids`.eeve. fithin the sleeve and abutting at its u per end against thepiston or head 63 is a elical spring 64 which tends to hold pitmansection at its outer limit relatively to the sleeve. The purpose andeffect of this construction is to insure a dwellafter full or completemovement of the oscillating arm 19 in its swing toward the bracket 38,or toward a fixed stop placed in its path and serving to limit the throwof arm 19 in that direction. Its movement in the "opposite direction islimited and determined by the length or radius of crank-arm 58, whichshould be slightly less than the radius of the arm 19, to the end thatthis arm and the pitman may never be completely alined, and that itsproper oscillation shall be assured without any tendency to swing past apoint at which the pitman will, at the proper time, reverse the swing ofsaid arm 19.

LAS the arm 19 swings to the right (Fi s. 2 and 3) .the end` of rod 47engages gie tooth 46 and moves the bar 44 longitudinally in an upwarddirection, or to the right as the parts are shown in Fig- 4. With thedog 43 in the position shbwn in said figure, with its shoulder or tooth46 opposite the abutment 42 of disk 40,it wil, soon after commencementof such movement, engage the latter, and as the movement continues causea partial rotation of said disk and consequently of the shaft 33. Thisin turn will cause a swinging movement of the arm 34 near the oppositeend of said shaft 33, and its pin35, engaging a wall of the slot inblock 36, willefect a longitudinal movement of rod 29, which through thearm 30 and lever 23 will edect a longitudinal movement of rod 26 and itsbunter 27, causing the finished work to be ejected from its position onthe work-supportingblade 6. As the movement of bar 44 continues, thedattened portion extending from the abutment 42 to the circumference ofthevdisk 40, or a projection thereon, rising beneath the latch 43, willlift the same and effect, a disengagement of the two teeth or abutments42 and 66whereupon spring 31, actingupon rod 29, will restore theejector and its actuatin devices to their normal positions, the normaosition of the ejector being that indicated in ig. 3. During theright-hand swing of arm 19, which effects the turningr of disk 40 andshaft 33, sleeve 15 is turned about the then clamped or fixed screw 14,which is threaded in a direction to cause, on such turning, an outwardmovement of the carrier 11 and control-wheel 4, thus effecting acomplete freeing of the finished object and permitting Aejection thereofwithout resistance.

In order that the precise point in the rotation of disk 40 at which thedog 43 shall disengage it, may be nicely adjusted and determine atrip-screw 6 is provided, the forward end of which passes through theflattened face of disk 40 extendincr from tooth or abutment 42 to thecircumference,

and by varying the extent of its projection beyond said face, the pointor time of trippin may be varied as desired. The recess 1n t e underside of bar 44, one wall of which constitutes the tooth 46, has at theopposite end a wall or shoulder 68, with which the bent rod 47 will makecontact when swinging to the left, in the event that said bar 44 failsto move back'; to normal position through gravity. In this way a`positive re-positioning of bar 44 and latch 43 is insured, and properengagement of the latch 1s started and caused to run at appropriatespeed, (and the Work or object to e ground is placed in position uponthe supporting blade 6. Shaft 57 turns to the right, and

the time that the crankin 59 of crank arm 58 is at its greatest distancefrom the pin of oscillating arm 19, at which time the telescoping pitmanis at itsy greatest extension. Further rotation of shaft 57 carries thecrank-arm 58 downward, and swings arm 19 to the left, permitting the bar44 and latch 43 to ride outward over the disk 40, so that the tooth ofthe latch shall pass beyond and drop to engaging position with referenceto the tooth or abutment 42 of the disk 40.

During this r vement of oscillating arm 19 to the left or toward itsstop 46, sleeve 15 to which arm 19 is secured as above explained, isrotated in a direction to advance the carrier 11 and the governing orcontrol-wheel 4toward the work, causing said wheel to press the workinto contact with the grinding wheel 3, and rotating the work, orpermitting it to rotate, at a definite and predetermined surface speed.As the grinding proceeds and sleeve 15 continues to the grindingoperation begins at or about I turn, the governing wheel is advancedvery gradually toward the grinding wheel, and this advance continuesuntil oscillating arm 19 makes contact'with and is arrested by stop 65,at which time, owing to the continuing movement of crank-arm 58 whilethe sleeve 62J is prevented from moving longitudinally, section 60 ofthe pitman telescopes with or slides into sleeve 62, compressing thespring 64 therein. The grinding and governing wheels, however, continueto rotate, but without any further inward movement or advance ofthegoverning or control-wheel, and the grinding, if not already completed,will be completed during the gradual compression of said sprin thusinsuring the complete grinding o the object.

When the crank-pin 59 asses the line extending from the center o shaft57 through the crank-pin of oscillating arm 19, at such time occupyingthe dotted line position indicated in Fig. 4, said arm 1!) will remainat rest, while spring G4 expands and follows the withdrawing section 60of the pitman. This condition will continue until the head or piston 63of pitman section 60 reaches the upper or outer end of the sleeve 62,whereupon the oscillating arm 19 will be raised and carried to theposition shown in Fig. 4, where it will engage with the tooth 46, movebar 44, and effect rotation of disk 40 and shaft 33, bringing about thetrain of movements above" described, and effecting longitudinalreciprocation of rod 26 and bunter 27, thereby ejecting the work fromthe work-rest. This action, owing to the disengagement of latch 43 bythe tripscrew 67, will be promptly followed by release of disk' 40, andthe return of the parts of the ejecting mechanism tonormal positionthrough expansion of spring 31.

The actual time required for the completion of this cycle of o)e1-ations is in reality short, but there is ail'orded in each cycleadequate time for placing in position upon the work-sup orting blade theobject to b e ground, which being done, the governing or control-wheeladvances, the rotation of the work and its grinding begin, the governingor control-wheel is steadily advanced until the work has beensuiiiciently ground, at which instant the advance of the governing wheelstops and later it is moved away from the grinding wheel to releasethework, the ejector is then actuated and the work discharged, the partsare restored to normal position, and the cycle is repeated.

The telescoping action of the two-'part pitman and colnpression of itsenclosed spring causes the oscillating arm 19 to remain at rest on itsstop 65, and the sleeve 15 to be likewise-held at rest during the timeof compression and ex ansion of spring 64, which is not complete untilcrank-arm 58 'approaches its point of greatest distance from thecrank-pin of arm 19, which in turn occurs just after the tri ping oflatch 43 and the ejection of'the nish'ed work. As the crank-arm 58passes a' straight line passing through the center of pin 59, the axisof shaft Y57, and the center of the pin connecting the pitman with arm19, said arm 19 begins its swing to the left, causing advance of thegoverning wheel, rotation of the work, continuing and gradual advance ofthe governing wheel, and return of arm 19 to the dotted line position ofFig. 4, with the results already described.

"time, the machine here illustrated an A stop-pin or other projection 69serves to limit t e outward movement of bar 44.

lVe are aware that grinding machines in which` the work is carried uponcenters mounted upon a reciprocating slide or carriage, and receivingblanks automatically from a magazine or container, carrying them past agrinding wheel, and releasing them when Ground, have heretofore beenconstructed and used. We are also aware that a similar constructionexcept that the grinding wheel was caused to travel relatively to thework instead of the work travellin tively to said wheel, has been empoyed. 'hilc machines of the character described are capable of turningout a considerable iven described has far greater capacity, and grindswithout the chattering which is diicult to avoid in grinding uponcenters particularly where such centers are, or either of them is,automatically advanced and receded relatively to the comganion center,to clamp and release the wor and are necessarily required to move quitefreely. Grinding the work while lying free upon a fixed rest or supportbetween a grinding wheel on the one side and a governing or controlwheel on the opposite side, and without axial movement of the workrelativel to the grinder, or movement of the grin er longitudinally ofthe work, effects a more rapid removal of material, and better insurestrue circular form and uniformity of Adiameter throughout the grindinglength, than is attainable by any other known construction.

While it is possible, and in some cases very desirable, to introduce theblanks or work and 'remove the finished objects, automatically, and suchautomatic in-fecd as well as discharge is contemplated, it is amountVof-wellrlinished work in a relanot here shown or described in detail,

but will probabl be presented in an independentA application. It ispossible under the construction shown to introduce the work manually,and to advance and recede the governing or control-wheel manually, bydetaching the pitman 60-61 from the oscillating arm 19 and swinging saidarm by hand, the parts retained acting in the same manner as whenactuated by power.

Various changes may be made in details of the structure here shownwithout departing from the spirit or scope of this invention. Thus asimple stud or pin may be substituted for the arm or. bent rod 47, andset in one or another of a series of holes in arm 19. Other forms oftrip mechanism may be employed instead of the disk 40, latch 43, andetch-bar 44, and the overning or control wheel carrier 11 may ge movedhv other well-known means instead of by the screw 14 and sleeve 15. Theembodiment of our invention here set forth is the bestl at present knownto us and is found to operate satisfactorily, and to produce perfectwork, but is illustrative only and subject to such modification as maybe made by skillful designers and mechanicians, within their own callingand without invention.

In the structure here illustrated the rinding wheel moves downward towarwork and work-rest and the governing or control-wheel moves upwardrelatively thereto, the grinding wheel at high surface speed and thegoverning or control-wheel at relatively low surface speed. This isattained by any suitable ratios. between the driving pulleys and thedriven pulle s, as is well understood in the art. T e governing wheel isjournaled in a bearing or bearings in the shell or carrier 11, butpreferably, as shown, in a separate extension 71 which is arranged totip about a horizontal pivot bolt 72 to permit a slight tilting of thegever-nin wheel axis relatively to that of the grin ing wheel and of theobject ground, so that the machine may, when desired, be used to feedobjects axially during the grinding, as is now done in centerlessgrinding machines of this general type. The extension 71 is clamped inits adjusted positions` iirst by means ,of the bolt 72, and second, bymeans of a clampin bolt 73 which engages an arcuate slot m one of theclamped members. The details of this construction are not a part of thepresent invention and any equivalent structure might be substituted, itbeing common in the centerless grinding art to mount the governing wheelfor such an lar adjustment. The grinding wheel sha t or arbor is carriedin 4a sleeve or bearing supported upon the main frame.

While there is shown and it is preferred to provide, a separate motorfor moving the adjustable element of the grindin couple toward and lfromits companion, and for actuating the ejector, it is obvious that powermay be taken from some continuousl rotating member or element of thegrindbI ing machine for that urpose, and the claims are to be read witthis understanding. In other words, the term motor as used in the claimscomprehends and includes any continuously rotating element of thecomplete grinding machine, from which the requisite power maybe takenand the necessary movements given, to actuate oscillating arm 19.

It is found advantageous with certain classes or forms of work to give avery slight inclination to the governing-wheel arbor, sullicient tomaintain the leading or inner end of the object in contact with thebunter 27 so long as the grinding continues.

What we claim is 1. A center-less grinding machine comthe prising, incombination, a grinding Wheel; a governingor control-wheel; inintermediate work-rest or support; means for progressively advancing andrecedin one of said wheels toward and from the ot er; and means forautomatically removing the work from between said wheels `after it iscompletely ground.

2. A centerless grinding machine, comprisin a grinding wheel; agoverning or contro -wheel peripherally opposed to the grinding Wheel; awork-rest or support intermediate said wheels, said wheels having theiraxes parallel; means for rotating the grinding and governing wheelsabout their respective axes in one and the same direction, the grindingwheel at a relatively high speed and the governing wheel at a relativelylow speed; means tor varying the distance between the proximateperipheral faces of said wheels; and means for automatically removingthe work from the workrest between said wheels when the grinding iscompleted.

3. A centerless grinding machine, comprising a grinding wheel and agovernin or control-wheel peripherally opposed, sai wheels having theiraxes in common plane; means for rotating said wheels about theirrespective axes in one and the same direction, the grinding wheel atrelatively high speed andthe governing wheel at relatively low speed; awork-rest between the effective operating faces of said Wheels, uponwhimrest the work lies without axial movement during the grinding; meansfor varyin the distance between the opposed working aces of the wheels;and means for automatically7 removing the work from the work rest whenIthe grinding is completed.

4. A grinding machine, comprising a grinding element; a, governing orcontrol element; an intermediate work-rest or support; means fordriving` the grinding andthe governing elements, the grinding elementmoving downward toward the work-rest at relatively high speed, and thegoverning element moving upwardtoward the work-rest at relatively lowspeed; means for automatically and progressively advancing one of saidelements toward the other gradually and to a predetermined extent, andthereafter separating said wheels to their original distance; and meansfor automatically ejectingl the work after the wheels have approached tothe, predetermined minimum distance of separation, and afterthevmovement of separation has begun.

5. A grinding machine, comprising a grinding element; a governing orcontrol element; an intermediate work-rest or support; means for drivingthe grinding and the governing elements, the grinding element movingdownward toward the Workrest at relatively high speed, and the governwing element movin upward toward the work-rest at relative y low speed;means for automatically and progressively advancin one of Said elementstoward the other gra ually and to a predetermined extent, and thereafterseparating said wheels to their original'distance; a motor connectedwith said advancing and receding means. and serving automatically toactuate and to reverse the same; and means for automatically removingthe work from the work-rest during the separating movement.

6. In combination with a grinding and a governing element; means forrotating the same in proper direction and at suitable relative speeds; awork-rest intermediate the grinding and the governing elements andserving to support the work while being ground; a bunter movable overthe Workrest in line with the axis of the work to be ground; anoscillatory shaft mounted in hearings, carrying a toothed disk, andconnected with said bunter substantially as described, to effect arcciprocatory movement of the bunter over the work-rest; a

motor; an oscillatory arm connected with and oscillated by said motor; aprojecting stud carried by the oscillating arm; a sliding ar engageableby said stud; and a latch carried by said bar and provided with ay toothto engage the tooth of the disk, Wherebv said disk and shaft maybe'turned to actuate the bunter.

'i'. In combination with a grinding and a .governing element; means forrotating the saine in proper direction and at suitable,

relative speeds; a work-rest intermediate the grinding and the governingelements and serviner to support the work while being groun a buntermovable over the workrest in line with the axis of the work to leground; an oscillatory shaft mounted in hearings, carrying a tootheddisk, and connected with said bunter substantially as described, toeffect a-reeipi'ocatory movement of the bunter over the work-rest; amotor; an oscillatory arm connected with and os- 4cillated by saidmotor; a projecting stud carried bv the oscillating arm; a sliding barengagenble by said stud; a latch carried by said bar and provided with atooth to engage the tooth of the disk, whereby said disk and shaft maybe turned to actuate the bunter; and a stud or shoulder upon the disksei-ving at a given point in its rotation to reease the latch fromengagement' with said disk.

S. ln combination with a grinding and a governing element; means forrotating the same in proper direction and at suitable relative speeds; awork-rest intermediate the grinding and the governing elements andserving to support the work while being freund; a bunter movable overthe workrest in line with the axis of the work to be ground-g anoscillatory shaft mounted in bearings, carrying a toothed disk, andconnected with said bunter substantially as described, to effect areciprocatory movement of the bunter over the work-rest; a motor; anoscillatory arm connected with and oscillatcd by said motor; aprojecting stud carried by the oscillating arm; a sliding bai' engal'ealele by said stud; a latch carried by said ar and provided with atooth to engage the tooth of the disk, whereby said disk and shaft maybe turned to actuatethe bunter; a stud or shoulder upon the disk servingat a given point in its rotation to release the latch from engagementwith said disk; and a spring for restoring the bunter and connectedparts to their normal position.

9. In combination with a grinding and a governing element; means `forrotating the same in propel' direction and at suitable relative s eeds;a work-rest intermediate the grinding and the governing elements servingto support the work while being ground); a bunter movable over theworkrest in line with the work to be ground; an oscillator shaft mountedin bearings and connecte with said bunter substantially as described, toeffect a reciprocatory movement of the bunter over the work-rest; anoscillatory arm; a projecting stud carried by said arm; a sliding barengageable by said stud; a latch carried by said bar and adaptedalternately to engage, partially rotate, and release the oscillatoryshaft; and a continuously rotating element con nected with and servingto reciprocate the latch-carrying bar.

10. In. combination with a suitable frame or base provided with alongitudinal guideway; a slide mounted and movable longitudinally uponsaid guideway and itself provided with a longitudinal guideway; meansfor clamping said slide upon and releasing it from the first-mentionedguideway; a shell or carrier mounted and movable longitudinall upon 'thesecond guideway, and provide! with means for clamping it to andreleasing it from said guideway; a governing ox control-wheel journaledin said carrier and movable therewith toward and from a grinding wheelmounted upon a shaft or arbor carried in a bearing or bearings upon themain frame of the machine; a work-rest carried by the slide and locatedbetween the opposed faces of the grinding and the governing wheels; an,internally threaded sleeve swiveled in said carrier and having. itsaxisparallel with the guideways of the bed and slide; a screw threadedto t the thread of said sleeve 'and extending into the same; a bracketcarried by the main frame, in which the outer end of the screw stem isswiveled; means for rotating said screw stem; means for rotating the`guideways of the bed and slide;

sleeve; and means for securing at will the screw stem or the sleeveagainst rotative movement; whereby the carrier or the carrier and theslide u on which it vis mounted may be moved orward or backward byrotation of the sleeve or the screw, as desired.

11. In combination with a suitable frame or base provided with alongitudinal guidewa a slide mountedand movable longitu inally upon saidguideway and itself provided with a longitudinal guideway; means forclamping said slide upon and releasing it from the first-mentionedguideway; a shell or carrier mounted and movable longitudinally upon thesecond guideway and provided with means for clamping it to and releasingit from said guideway; a governing or control-wheel journaled in saidcarrier and movable therewith toward and from a grinding wheel mountedupon a shaft or arbor carried in a bearing or bearings u on the mainframe of the machine; a wor '-rest carried by the slide and 'locatedbetween the opposed faces of the grinding and the governing wheels; aninternally threaded sleeve swiveled in said carrier and having its axisparallel with the a screw threaded to fit the thread of said sleeve andextending into the same; a bracket carried by the main frame in whichthe outer end o f `the screw stem is swiveled; ineans for rotating saidscrew stem; means for rotating the sleeve; means for securing at willthe screw stem or the sleeve against rotative movement; a work-ejectingbunter movable over and in line with the workrest; an actuating shaftfor said bunter, journaled at one end in a bearing upon and movable withthe slide, and at its opposite end'extending through ears movable withthe governing-'Wheel carrier; a disk encircling said shaft, locatedbetween said ears,

and Islidable upon but incapable of rotation independently of theoscillatory shaft; and automatic mechanism for alternately engaging,partially rotating, and releasing said disk to effect oscillation of theshaft in one direction after the grinding is 'completed and the carrierhas be un its outward movement, and to permit t le return of the shaftand connected parts to normal position when released by the latch. Y

12. A. grinding machine, com rising a grinding element and an o posegoverning or control element, the atter mounted in a carrier movabletoward and from the grinding element; a work-rest between the grindingand the governing elements; an ejector movable over and in proximity tothe work-suppprting face of said rest; an actuating sha connected withand serving to move the ejector in one direction over the the operativerelation of said shaft and its actuating devices.

13. In a grinding machine, a grinding element and an opposed governingor control element, one mounted for rotation in a carrier movable towardand from the other; a slide rovided with guideways upon which said)carrier is mounted and movable; guideways upon theimain frame of themachine u on which said slide is guided and mova'le; a work-rest carriedby said slide and extending into the space between the grinding and thegoverning ele'- ments; means for locking the carrier to the slide andfor releasing it therefrom at will; means for locking the slide to theguideway on the frame and releasing it therefrom; and means for movingthe carrier toward and from the work-rest, both with the slide whenlocked thereto, and independently ot the slide when unlocked therefrom.

14. A centerless grinding machine comprising in combination, a grindingwheel; a governing or control-wheel; an intermediate work-rest orsupport; means for progressively advancing `and receding one of saidwheels toward and from the other; means for automatically removing thework from between said wheels after it is completely ground; and meansfor causing the work being ground to maintain contact with the bunteruntil ejected.

15.l A centerless grinding machine comprising in combination, a grindingwheel; aY governing or .control-wheel; an intermediate work-rest orsupport; means for progressively advancing and receding one of saidwheels toward and from the other; and means for automatically removingthe work from between said wheels after it is completely ground, theoverning wheel being capable of having its axis tilted out of parallelrelation to that of the grinding wheel, whereby the inner or leading endof the object ground will be maintained in contact with the ejectingbunter until ejection takes place. v

16. A centerless grinding machine 'comprising, in combination, agrinding wheel; a governing or control-wheel; an intermediate work-'restor support; means for progressively advancing and receding one of tomaintain contact with the ejecting bunter said wheels toward and fromthe other; and until ejection occurs. 10 means for automaticallyremoving the work In testimo'n;y whereof we have signed from betweensaid wheels after it is con1' our names to this specication.

pletely ground, the governing wheel hnv- 1 its axis tilted slightly outof parallel "SOL EINSTEIN.

rgtion to that-of the grindin wheel, and LESTER F. NENNIN GER.

in a direction to cause the o ject ground WALTER D. ARCI-IEA.

gressively advancing and recedin one of .to maintain contact with theejecting bunter i said wheels toward and from the ot er; and untilejection occurs. means for automatically removing the work In testimonywhereof we have signed from between sald wheels after it is com-` ournames to this specification.

pletely ground, the governing wheel havmg axis tilted sllghtly out ofparallel SOL EINSTEIN.

relation to thatlof the grinding Wheel, and LESTER F. NENNINGER.

1n a direction to cause the object ground WALTER D. ARCHEA.

DlscLAlMEzR.

1,575,558.-Sol Einstein and'Lester F. Nenm'nger, Cincinnati, Ohio, andWalter D. Archeo, Norwood; Ohio. CEN'rnnLEss Grumman MACHINE; Patentdated March 2, 1926. Disclaimer filed March 8, 1929, y the patentees,the assignee b y mesne assignments, Cincinnati Grinders Incorporated,assenting and concurrlng. f i

Hereby enter this disclaimer to the subject matter of claims 1, 2,-and 3in the said specification, which claims read as follows:

1. A eenterless grinding machine comprisingfin combination, a grindingwheel;

a governing or control-wheel; an intermediate work-rest or sup ort;means for progressively advancing and receding one of said Wheels towardam? from the other;

and means for automatically removing the work from between said wheelsafter it is completely ground. v A

2. A centerless grinding machine, comprisin a grinding Wheel; agoverningor control-wheel peripherally opposed te the grin mg wheel; a werk-restor support intermediate said wheels, said wheels having their axesparallel; means for rotating the grinding and governing wheels abouttheir respective axes in one and the same direction, the grinding wheelat a relatively high speed and the governing wheel at a relatively lowspeed; means for varying the distance between the proximate peripheralfaces of said wheels; and means for automatically removing the work fromthe work-rest between said wheels when the grinding is completed. p Y

3. A centerless grinding machine, comprising a grinding wheel and agoverning or control-wheell peripherally opposed, said wheels havingtheir axes in common plane; means for rotating said wheels about theirrespectlve axes in one and the same direction, the grinding wheel atrelatively high speed and the governing wheel at relatively low speed; awork-rest between the respective operating faces of s'aid wheels, uponwhich rest the work lies without axial movement during the grinding;means for varying the distance between the opposed working faces of thewheels; and means for automatically removing ythe work from thework-rest when the grinding is complete [Oficial Gazette April 9, 1929.]

DISCLAIMER.

1,575,558.-Sol Einstein and yLester F. Nenni'nger, Cincinnati, Ohio, andWalter D. Archeo', Norwood; Ohio. CENTERLEss GRINDING MACHINE. Patentdated March 2, 1926. Disclaimer filed March 8, 1929, j the patcntees,the assignee by mesnc assignments, Cincinnati' Grinders Incorpora/ted,assenting and concurring.

Hereby enter this disclaimer to the subject matter of claims 1, 2, and 3in the said specification, which claims read as follows:

1. A centerless grinding machine comprising,in combination, a grindingwheel; a governing or control-wheel; an intermediate work-rest or suport; means for progressively advancing and receding one of said wheelstoward an from the other; and means for automatically removing the workfrom between said wheels after it is completely ground.

2. A centerless grinding machine, comprisin a grinding wheel; agoverning or control-wheel peripherally opposed to the grin ing wheel; awork-rest or support intermediate said wheels, said wheels having theiraxes parallel; means for rotating the grinding and governing wheelsabout their respective axes in one and the same direction, the grindingwheel at a relatively high speed and the governing wheel at a relativelylow speed; means for varying the distance between the proximateperipheral faces of said wheels; Aand means for automatically removingthe work from the work-rest between said wheels when the grinding iscompleted.

3. A centerless grinding machine, comprising a grinding wheel and agoverning or controlwheel peripherally opposed, said wheels having theiraxes in common plane; means for rotating said wheels about theirrespectlve axes in one and the same direction, the grinding wheel atrelatively high speed and the governing wheel at relatively low speed; aworkrest between the respective operating faces of s'aid wheels, uponwhich rest the work lies without axial movement during the grinding;means for varying the distance between the opposed Working faces of thewheels; and means for automatically removing the work from the work-restwhen the grinding is completed.

[Oficial Gazette April 9, 1929.]

